Tool Number 
An identifier for a piece of equipment that can be used in an operation.
A tool can be used on more than one resource. Tools typically are hand-held or at least portable, and, unlike resources, are not scheduled by the shop floor manager. By contrast, a large piece of testing equipment or an entire workbench at which testing is performed would be defined as a resource.
Tool numbers can have the following attributes:
Status
Tool Group
Qty Available
Location
Calibration Type
Start Calibration Date
Calibration Period
Expiration Date
For more information, see Tool Number Maintenance.
You can assign tool numbers to a tool group (see Tool Group Maintenance).
You can change the status of a tool number or all tool numbers in a tool group (see Change Equipment Status).
If you use the SAPMEINT component, see Integration of Equipment.